使用firewall.dll属性时出现拒绝访问错误.(HRESULT中的异常:0x80070005(E_ACCESSDE

我有使用firewall.dll向windows防火墙添加规则的代码，但我得到了此异常"访问被拒绝。（HRESULT中的异常：0x80070005（E_ACCESSDENIED））"这是我的代码：

using NetFwTypeLib;
namespace Tserver
{
    class Program
    {
    static void Main(string[] args)
    {
        INetFwRule firewallRule = (INetFwRule)Activator.CreateInstance(
        Type.GetTypeFromProgID("HNetCfg.FWRule"));
                   firewallRule.Action = NET_FW_ACTION_.NET_FW_ACTION_BLOCK;
        firewallRule.Description = "Used to block all internet access.";
        firewallRule.Direction = NET_FW_RULE_DIRECTION_.NET_FW_RULE_DIR_OUT;
        firewallRule.Enabled = true;
        firewallRule.InterfaceTypes = "All";
        firewallRule.Name = "Block Internet";
        INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(
            Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
        firewallPolicy.Rules.Add(firewallRule);
}